A recent investigation conducted by a team of experts from The Associated Press (AP) revealed that the water of Rio de Janeiro, venue for next Olympics, had incredibly high levels of viruses and bacteria from sewage.

The AP for nearly five months conducted four rounds of tests at Olympic sites, and found that none of them was ready for swimming or boating events.

Investigation's results consistently found large amounts of active and infectious human adenoviruses, which can cause respiratory trouble and intense vomiting and diarrhea, with concentrations similar to those seen in raw sewage.

Investigators found that one of the sites, Rodrigo de Freitas Lake, was thought to be cleaned up, but was found to have 14 million adenoviruses per liter to 1.7 billion per liter.

Marine biologist John Griffith said, "What you have there is basically raw sewage. It's all the water from the toilets and the showers and whatever people put down their sinks, all mixed up, and it's going out into the beach waters".

Reports have revealed that some competitors who have trained in Rio have become sick. The participants have complained fever, vomiting, and diarrhea.

The Austrian sailing team has been training for months in the Guanabara Bay, and coach Ivan Bulaja said that it is so far the worst water quality they have ever seen in their sailing careers.

He added that they are quite sure if they swim continuously in this water, then lots of impurities will go inside their bodies and they could become severely ill.

It has been said that in Rio, most of the waste goes through open-air ditches, down through streams and rivers that feed the Olympic water sites.